Blue Catfish Swimming in the Shallows Near Mount Vernon, Virginia. Image Credit: Jay Fleming.

WHY DO BLUE CATFISH POSE A THREAT TO VIRGINIA’S WATERS?

Blue catfish are an invasive fish species that threatens the populations of other native aquatic species in the James River watershed: menhaden, American shad, Atlantic sturgeon, striped bass, smallmouth bass, and blue crabs. Blue catfish were initially introduced into the James and Rappahannock rivers in 1974 to establish a recreational fishery. Since their introduction, the population of blue catfish has expanded rapidly, accounting for up to 75% of biomass in local rivers and leading to a prolific population in all of the Chesapeake Bay’s tributaries. 

There are many factors that contribute greatly to the blue catfish’s ability to dominate the Chesapeake Watershed:

• Blue catfish can live for a very long time and repopulate significantly. Blue Catfish are long-lived, usually living 9 to 10 years, with some documented to be as old as 25 years old. Their life cycle improves the ability of juveniles to survive and reproduce through increased parental presence and the production of larger eggs. Highly reproductive females can lay up to 8,000 eggs per kilogram of body weight, meaning a 10 pound catfish can produce up to 20,000 eggs. Not only does this increase the survivability of the blue catfish, it also increases their size; in 2011, a record holding blue catfish caught in Buggs Island weighed 143 pounds!

• Blue Catfish are incredibly resilient to environmental changes and food scarcity. They are more tolerant to sudden environmental changes and can even survive in waters with different salinity, temperature, and water quality. They can also survive on little food for several months due to their very slow metabolism and their ability to store fat, which helps conserve their energy.

• Blue catfish are apex predators, eating almost everything available in their environment. This poses a threat to many native species in the Chesapeake and its tributaries, such as menhaden, American shad, Atlantic sturgeon, striped bass, smallmouth bass, blue crabs, and river herring. Blue catfish also impact other native species living in the Chesapeake Bay Watershed, like ospreys, bald eagles, and herons by severely depleting their own food sources. 

• Blue catfish live in all parts of the water column, from the surface to the bed. A common misconception is that all catfish are bottom-dwelling scavengers that feed primarily on detritus along riverbeds. Instead, they occupy and feed throughout the entire water column, often foraging in near-surface, mid-water, and bottom-dwelling habitats. As highly opportunistic predators, blue catfish consume a wide variety of prey wherever they are found, allowing them to affect species and ecological processes throughout the Bay’s ecosystems.

Blue catfish have continued disrupting the delicate balance of the Chesapeake Bay and its tributaries for over 50 years. Posing threats to the native aquatic species of Virginia, negatively impacting historically and culturally significant native species like American shad and Atlantic sturgeon. Virginia potentially loses millions of dollars due to blue catfish predation on commercial fisheries like menhaden and blue crabs. These two fisheries made roughly 110 million dollars in 2024 alone. Blue catfish pose a unique threat to Virginia’s waterways and require unique solutions in order to manage the population effectively. 

Take a look at our Land Use & Wildlife Conservation issue page to keep updated for the latest blue catfish news in our Commonwealth.